Insulating device.



D. C. HUGHES.

lNSULATlNG DEVICE.

APPUCATION 111:0 MAR. 9. 1915.

1,203,343. Patented Oct. 31,1916.

Fig. 1

Pig. 2.

WITNESSES INYENTUR DALE E. HUGHES,

H15 ATTU NE'xcuit. rials have the objection that they are more UNITED STATES PATEN OFFICE.

DALE C. HUGHES, OF CLEVELAND, OHIO, AISSIGNOR TO GENERAL A CORPORATION OF NEW YORK.

ELECTRIC COMPANY,

' INSULATING nnvrcn.

To all whomit may concern:

Be it known that I, DALE C. HUGHES, a citizen of the United States, residing at Cleveland, county of Cuyahoga, State of Ohio, have invented certain new and useful Improvements in Insulating Devices, of which the following is a specification.

My invention relates to electric incandescent lamps, and more especially to means for insuring the proper insulation'between the external conductors or leading-in wlres whi h are lamps.

In the manufacture of incandescent lamps the leading-in wires are sealed for a portion of their length in the flattened end of a short glass tube, the other end of which is open and around which the bulb is fused to form.

a seal. The leading-in wires extend through the tube, and it is necessary to prov de means for keeping them separate and insulated from each other throughout their length as, otherwise, a short circuit might occur. the case of of a lamp such as that covered by Langmuir application Serial No. 762,327, filed April 19, 1913, it is necessary to employ a refractory material on account of the comparatively high temperature whlch 1s reached by the said lamps. been used is asbestos or slag wool. A wad of this is inserted between the leading-in wires, and when the lamp is subsequently based it is necessary tube to prevent foreign material from getting into the tube and causing a short cir- Slag wool and other similar mateor lesshygroscop c and their accumulation v of IIlOlStllIGWIlll in time produce a short cir-- cuit or leakage of the current.

The object of my invention-is to provide an eflicient insulating and separating means which will not have this objectionable characteristic.

I Moreover,-'it is the object ofmy invention to provide means which will obviate the necessity of a double insulation and capping of the tube.

Further advantages of my invention will appear from the detailed description which used in connection with such lamps which have been on the market for some time the temperature is sufiiciently low so that cotton or similar material may be used. However, in the case One material which hasto cap the end of the operation to secure the Patented Oct. 31, 1916.

Application filed March 9, 1915. Serial No. 13,118. a

' follows, and from the accompanying drawmg. I

In the drawing, Figurel is an elevation, partly 1n sectlon, of an electric incandescent lamp embodying my invention. Fig. 2

invention.

'In the drawing, 10 is an electric incandescent'lamp ofthe general character disclosed in the Langmuir application hereinbefore referred to. Thesaid lainp comprises a tube 11 and the external flange 12' at the upper end of the same is fused to the bulb 13. The leading-in wires 14 are connected by means of the platinum or other sealing wire 15 to the metallic support 16 for the filament 17. In the making of'the lamp the end of tube 11 "is fused and flattened around the wires 15 and the ends of wires 14 and 16 so as to constitutea hermetic seal. As shown in 'Fig. 2, the plug 18 is hollow and is open at one end 19 and tapered gradually to the is a perspective of the plug comprised by my In closed end 20. Grooves 21 are formed in the sides of the plugand are diametrically opp'osite. The plug 18 is of such size that it extends into the tube 11 and fits snugly near its outer end with the sides of said tube. The leading-in 'wires are caused to engage the grooves 21 and are then crimped over the edge of the plug 18 so as to hold the same securely in place.

It will be apparentthat after the insertion of the plug and the connecting of the wires as above described, the lamp may be based without further capping of the tube 14. It will be apparent, also, that the leading-in wires can not by any possibility short circuit, as they are held securely within the grooves.21. This is true even should there sible to use other refractory material. The

construction of the plug is such that it can be very easily handled by inserting the end of the finger thereinto in the same manner as into a thimble.

What I claim as new and desire to secure by Letters Patent of the United States, is

' 1. An electric incandescent lamp comprising a bulb, a glass tube sealed to the said bulb and extending thereinto, leading-in 'wires passing through the said tube and leading-in wires.

sealed in one end thereof, and a refractory plug closing the other end of. the said tube, said plug being. grooved to receive the said 2. An electric incandescent lamp comprising a bulb, a tube sealed to said bulb and extending thereinto, leading-in Wires passing through said tube and sealed in one end thereof, and a removable plug of refractory material closing the other end of saidtube and having grooves therein to receive the said leading-in Wires, said leading-in Wires being crimped over the end of the said plug to hold the same in place.

.3. An electricincandescent lamp comprising a bulb, a tube sealed to said bulb and extending thereinto, leading-in Wires passing through the material closing one end of the said tube and having grooves in its outer surface to receive the said leading-in Wires.

In Witness whereof, I- have hereunto set my hand this 5th day of March, 1915.

DALE C. HUGHES. Witnesses: Q

Jos. E. KEWLEY, J. H. ANDERSON.

said tube and sealed to one end thereof, and a hollow plug of refractory 

